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2001 News Release
April 5 
April 5, 2001
Hitachi Metals Develops High-Output GMR Sensor
Tokyo, Japan, April 5, 2001-Hitachi Metals, Ltd., announced today that it has developed a GMR membrane high-output GMR (giant magneto-resistive) sensor that is highly resistant to temperature variation.
1. Background
Hitachi Metals has been manufacturing AMR (anisotropic magneto-resistive) sensors for use with rotary encoders and linear encoders that read magnetic signals and detect rotational angle and positioning.Compatible with a greater variety of environments than optical and other types of sensors, these magnetic sensors are widely used in the positioning of industrial machine tools and such OA equipment as printers.
In recent years, the market has come to demand the development of magnetic sensors that are compatible with the technical advancements, reductions in size, higher outputs, increased sensitivity, and higher resolution of today's leading edge equipment.
These advancements have necessitated the development of new elements because AMR sensors have a limited capacity to meet these demanding parameters. Hence, leveraging the ultrathin membrane, thin membrane laminating, and material design technologies accumulated through its experience in the field of magnetic head wafers, Hitachi Metals has succeeded in developing its own GMR elements, which are superbly resistant to temperature variations and highly environment-friendly. Using these elements, Hitachi Metals has brought to market highly stable, high-output GMR sensors.
In practice, these GMR sensors will enable compact and highly precise positioning and should find numerous uses in cameras, printers, and other compact and high definition devices.
2. Unique Features
(1) High output- Three times the output of Hitachi Metals' AMR sensors
- Magnetic resistive effect of 10% (±7000A /m)
- Output variance between - 40°C and 120°C: ±20%
or lower
- Degradation in characteristics after heat processing at 250°C:
5% or lower.
3. Parameters
| (1) | Circuit resistance: | 500W |
| (2) | Magnetoresistive effect: | 10%(±7000A/m) |
| (3) | Magnetoresistive effect: | 5%(±2000A/m) |
| (4) | Sensing field: | 7000 A/m |
| (5) | Operating temperature range: | - 40°C to 120°C |
| (6) | Mid point voltage: | 2.5V±0.5V(Supply voltage:5V) |
| (7) | Offset voltage drift: | ±5mV or less. |
4. Applications
Machine tools, cameras, printers, rotary encoders for copiers and other such machines, linear encoders, motion sensors, position sensors, and others5. No. of Patents
Five6. Sales Outlook
Fiscal 2001: 100,000 units per monthFiscal 2002: 1 million units per month
7. Manufacturing and Sales
Handled by Hitachi Metals, Ltd., New Business Promotion CenterFor further information, contact:
| Hitachi Metals, Ltd. New Business Promotion Center, Officer in charge: Mr. Matsuzaki. Tel:+81-3-5765-4586 Hitachi Metals, Ltd. Corporate Communications Group Officers in charge: Mr. Shoji and Mr. Masuoka. Tel: +81-3-5765-4079 |
